*{
    padding: 0;
    margin: 0;
}
#header-nav{
    width: 100%;
    position: fixed;
    top: 0;
}
.navbar-nav{
    width: 90%;
} 
#header-content li{
    margin: 0 20px 0 20px;
}
.navbar-inverse .navbar-nav>li>a{
    color: white;
    font-size: 18px;
}
.navbar-inverse .navbar-nav>li>a:hover{
    color: yellowgreen;
}
.navbar-nav>li>a{
    padding: 0;
    margin: 0;
    line-height: 50px;
}
.dropdown-menu{
    width: 100px;
}

/* 教师管理 */
#teacher-manager div{
    width: 80px;
    /* border: 1px solid red; */
    z-index: 999;
    background-color: #222222;
    text-align: center;
}
#teacher-manager div a{
    color: white;
    margin: 4px;
    font-size: 16px;
    text-decoration: none;
}
#teacher-manager div a:hover{
    color: yellowgreen;
}

/* 课程管理 */
#course-manager div{
    width: 80px;
    /* border: 1px solid red; */
    z-index: 999;
    background-color: #222222;
    text-align: center;
}
#course-manager div a{
    color: white;
    margin: 4px;
    font-size: 16px;
    text-decoration: none;
}
#course-manager div a:hover{
    color: yellowgreen;
}

/* 学校管理 */
#school-manager div{
    width: 80px;
    /* border: 1px solid red; */
    z-index: 999;
    background-color: #222222;
    text-align: center;
}
#school-manager div a{
    color: white;
    margin: 4px;
    font-size: 16px;
    text-decoration: none;
}
#school-manager div a:hover{
    color: yellowgreen;
}

